221244040 has 64 divisors (see below), whose sum is σ = 512697600. Its totient is φ = 85882368.

The previous prime is 221244019. The next prime is 221244043. The reversal of 221244040 is 40442122.

It is a junction number, because it is equal to n+sod(n) for n = 221243999 and 221244017.

It is not an unprimeable number, because it can be changed into a prime (221244043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257131 + ... + 257989.

It is an arithmetic number, because the mean of its divisors is an integer number (8010900).

Almost surely, 2^221244040 is an apocalyptic number.

221244040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221244040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256348800).

221244040 is an abundant number, since it is smaller than the sum of its proper divisors (291453560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221244040 is a wasteful number, since it uses less digits than its factorization.

221244040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054 (or 1050 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 221244040 is about 14874.2744360859. The cubic root of 221244040 is about 604.8168195284.

Adding to 221244040 its reverse (40442122), we get a palindrome (261686162).

The spelling of 221244040 in words is "two hundred twenty-one million, two hundred forty-four thousand, forty".